Question

Find the $AM$ using Assumed mean method for the following data shows distance covered by $30$ passengers to perform their jobs.

• A. $27.33$
• B. $28.33$
• C. $29.33$
• D. $30.33$

Answer 1

Answer: (B)

$28.33$

Answer:- By shortcut Method

Distance (km) (x)	No. of passengers (f)	d=x-A	fd
15	2	-10	-20
20	4	-5	-20
25=A	6	0	0
30	8	5	40
35	10	10	100
	$\Sigma f=30$		$\Sigma fd=100$

Mean = $A+\frac{\Sigma fd}{\Sigma f}=25+\frac{100}{30}=25+3.33=28.33$

B)28.33